#include<iostream>

using namespace std;

int main()

{

	int n;

	while(cin>>n)

	{

		int count=0;

		while(n != 1){

			if(n%2==0)n=n/2;

			else n=3*n+1;

				count++;

		}

		cout<<count<<endl;

	}

	return 0;

}